Columnar-cell (non-carcinoid) tumours of the appendix.
D000230:Adenocarcinoma / Q000473:pathology*; D000368:Aged; D001063:Appendiceal Neoplasms / Q000453:epidemiology / Q000473:pathology* / Q000601:surgery; D003537:Cystadenoma / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009078:Mucocele / Q000473:pathology*